/*
 * Copyright (C) 2012 CyberAgent
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.jarlen.photoedit.filter.base;

public class TextureRotationUtil
{

	public static final float TEXTURE_NO_ROTATION[] = {0.0f, 1.0f, 1.0f, 1.0f,
			0.0f, 0.0f, 1.0f, 0.0f,};

	public static final float TEXTURE_ROTATED_90[] = {1.0f, 1.0f, 1.0f, 0.0f,
			0.0f, 1.0f, 0.0f, 0.0f,};
	public static final float TEXTURE_ROTATED_180[] = {1.0f, 0.0f, 0.0f, 0.0f,
			1.0f, 1.0f, 0.0f, 1.0f,};
	public static final float TEXTURE_ROTATED_270[] = {0.0f, 0.0f, 0.0f, 1.0f,
			1.0f, 0.0f, 1.0f, 1.0f,};

	private TextureRotationUtil()
	{
	}

	public static float[] getRotation(final Rotation rotation,
			final boolean flipHorizontal, final boolean flipVertical)
	{
		float[] rotatedTex;
		switch (rotation)
		{
			case ROTATION_90 :
				rotatedTex = TEXTURE_ROTATED_90;
				break;
			case ROTATION_180 :
				rotatedTex = TEXTURE_ROTATED_180;
				break;
			case ROTATION_270 :
				rotatedTex = TEXTURE_ROTATED_270;
				break;
			case NORMAL :
			default :
				rotatedTex = TEXTURE_NO_ROTATION;
				break;
		}
		if (flipHorizontal)
		{
			rotatedTex = new float[]{flip(rotatedTex[0]), rotatedTex[1],
					flip(rotatedTex[2]), rotatedTex[3], flip(rotatedTex[4]),
					rotatedTex[5], flip(rotatedTex[6]), rotatedTex[7],};
		}
		if (flipVertical)
		{
			rotatedTex = new float[]{rotatedTex[0], flip(rotatedTex[1]),
					rotatedTex[2], flip(rotatedTex[3]), rotatedTex[4],
					flip(rotatedTex[5]), rotatedTex[6], flip(rotatedTex[7]),};
		}
		return rotatedTex;
	}

	private static float flip(final float i)
	{
		if (i == 0.0f)
		{
			return 1.0f;
		}
		return 0.0f;
	}
}
